Atmail is a fully-featured email server and Webmail client, allowing users to send and receive email via a Web browser or mobile device. It has full support for
IMAP mailboxes, and an optional email-server mode that uses EXIM as the MTA. Features include a scheduler, MySQL backend support, spell-check, address book, calendar user preferences, multiple accounts, SpamAssassin support, migration scripts from other mail servers, a customizable interface, an attractive AJAX interface, an optional group sharing Calendar/Addressbook, and an Outlook plugin to sync Contacts/Tasks/Calendar data between a Desktop, Mobile, and Webmail client or other email users.

Achievo is a Web-based project management and tracking tool for small- to medium-sized companies, aiming to become a fully featured ERP-like system in the future. Features include a time registration module, scheduler, project management, todo's, and several statistical tools. Achievo is multi-language, fully customizable, and uses a modular system to allow future extensions.

Actionpoll is a simple PHP script which provides the standard functionality such as unlimited options, IP tracking of users, easy installation, and HTML and WML output. An event can be triggered if a certain number of votes is reached. Surveys can be stored either in a MySQL database or in text files.

adept is a system for developing short courses for users needing to learn specific skills or knowledge. adept provides JIT ("just in time") learning, in contrast to the more usual "just in case" learning. It can be used as an intranet application to propagate knowledge to employees, or to educate customers via your homepage.

ADODB is a set of advanced PHP database
abstraction classes. It supports MySQL,
PostgreSQL, Interbase/Firebird, Informix, Sybase
SQL Anywhere, Oracle, MS SQL 7 and 2000, SAP DB,
Sybase, DB2, FrontBase, Foxpro, Access, Netezza,
LDAP, ODBTP, ADO, and generic ODBC. A metatype
system is built in, making it possible to figure
out that types such as CHAR, TEXT, and STRING are
equivalent in different databases. It also
features portable database creation,
database-backed session support (with encryption),
SQL performance monitoring, and database health
checks.

Apache Toolbox provides a means to easily compile
Apache (IPv4/6) SSL, PHP(v3/v4), MySQL, Jakarta, a
large number of modules (61 3rd party modules and
36 default Apache modules, static or as DSOs), and
GD libraries with PNG+JPEG+Freetype2+zlib support.
It is fully customizable and menu-driven.
Everything is compiled from source, and wget is
used to download any missing modules. It can also
check for RPMs that might cause problems and
create an RPM with your selections.

The APC Action Applications (APC-AA) provide an easy automated publishing environment for non-profit websites. Features include 'Usenet-like' sharing of articles between sites, automated publishing of press releases, bibliographic information, who's who, event calendars, and more for multiple sites, and runs on Apache PHP/MySQL, with an optional plugin to store authentication information in LDAP. The software is also multi-lingual, and supports multiple character sets.

Ariadne is a Web Application Framework and Content Management System built with PHP. It
allows you to build complex Web applications and sites with ease. It takes care of
the mundane stuff like internationalization, security, user management, templating, data
retrieval and storage, caching, and site management. It stores content in a structured
object store that can be accessed through an extensive filesystem-like API.